debug_render.py

from pathlib import Path
import subprocess
from app.models.project import *
from app.services.ffmpeg_renderer import FFmpegRenderer

base = Path('tmp_render_debug4')
base.mkdir(exist_ok=True)

def write_test_image(path):
    subprocess.run(['ffmpeg','-y','-f','lavfi','-i','color=c=blue:s=1920x1080:d=1','-frames:v','1',str(path)], check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)

def write_test_audio(path,duration):
    subprocess.run(['ffmpeg','-y','-f','lavfi','-i', f'sine=frequency=1000:duration={duration}', str(path)], check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)

scenes=[Scene(scene_number=1,start_time=0,end_time=3,duration_seconds=3,narration='one',visual_description='scene one',on_screen_text='',visual_type='image'),Scene(scene_number=2,start_time=3,end_time=6,duration_seconds=3,narration='two',visual_description='scene two',on_screen_text='',visual_type='image')]
scene_plan = ScenePlan(scenes=scenes)
image1=base/'img_1.jpg'; image2=base/'img_2.jpg'
write_test_image(image1); write_test_image(image2)
audio = base/'narration.wav'; write_test_audio(audio,6)
subtitle = base/'subtitles.srt'; subtitle.write_text('1\n00:00:00,000 --> 00:00:03,000\none\n\n2\n00:00:03,000 --> 00:00:06,000\ntwo\n', encoding='utf-8')
project = VideoProject(
    id='proj-render',
    topic='Render test',
    duration_seconds=6,
    audience='general',
    style='cinematic',
    status=ProjectStatus.MEDIA_READY,
    scenes=scene_plan,
    media_assets=MediaAssets(
        visual_assets=[
            VisualAsset(scene_number=1, asset_type='image', file_path=str(image1)),
            VisualAsset(scene_number=2, asset_type='image', file_path=str(image2)),
        ],
        audio_asset=AudioAsset(file_path=str(audio), duration_seconds=6),
        subtitle_file=SubtitleFile(
            file_path=str(subtitle),
            entries=[
                SubtitleEntry(sequence_number=1, start_time=0, end_time=3, text='one'),
                SubtitleEntry(sequence_number=2, start_time=3, end_time=6, text='two'),
            ],
        ),
    ),
)
orig_run = subprocess.run

def traced_run(cmd, **kwargs):
    print('RUN', cmd)
    res = orig_run(cmd, **kwargs)
    print('RET', getattr(res, 'returncode', None))
    if hasattr(res, 'stderr') and res.stderr:
        print('STDERR', res.stderr[:300])
    return res

subprocess.run = traced_run

renderer = FFmpegRenderer(base_output_dir=base)
out = renderer.render(project)
print('status', out.status)
print('error', out.error_message)
print('output', out.output_video_path)
print('info', out.render_info)